Why is my lighting circuit at 20V?

I tend to use them for fancy fittings where removing the fitting from the ceiling to access the terminals is impractical during testing.
 
ericmark said:
He says switched on so I will guess the neutral live wire to earth. The line live switched wire to un-switched line live should be zero and to any other wire 230 volt.
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He said the lighting circuit was on, not specifically the fitting he was testing at was on
 
Echo the husky said:
I tend to use them for fancy fittings where removing the fitting from the ceiling to access the terminals is impractical during testing.
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